and pushed him off of the track. As MAL tried to rejoin HAM gave zero room again,

Here is an excerpt from the sporting regulations. I interpret it as meaning that it is the full responsibility of the driver rejoining the track to make sure it is safe. Which means Hamilton was under no obligation to make room from a legal context.

Quote:

FIA Sporting Regulation 20.2:
...Should a car leave the track the driver may rejoin, however, this may only be done when it is
safe to do so and without gaining any advantage...